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	content="碳氢知识平台由碳三氢二个人创建，属于免费开放的知识浏览平台。该平台主要用于学习Java相关的知识。">
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					  <li class="layui-nav-item ">
					  	<a href="javascript:;" style="font-size: 30px; color: #000000;">学习</a>
					    <dl class="layui-nav-child"> <!-- 二级菜单 -->
					      <dd><a href="/second/knowledge/1" style="height: 30px; line-height: 26px;">九年级上册</a></dd>
					      <dd><a href="/second/knowledge/2" style="height: 30px; line-height: 26px;">九年级下册</a></dd>
					      <dd><a href="/second/knowledge/3" style="height: 30px; line-height: 26px;">必修一</a></dd>
					      <dd><a href="/second/knowledge/4" style="height: 30px; line-height: 26px;">必修二</a></dd>
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							        <span class="btn btn-block text-left" style="color: #007bff;font-size: 20px;" data-toggle="collapse" data-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
							          	第一单元　走进化学世界
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							      		<p style="color: #007bff;font-size: 16px; padding:.25rem 1.75rem">课题1　物质的变化和性质</p>
							      		<p style="color: #007bff;font-size: 16px; padding:.25rem 1.75rem">课题2　化学是一门以实验为基础的科学</p>
				 			      		<p style="color: #007bff;font-size: 16px; padding:.25rem 1.75rem">课题3　走进化学实验室</p>
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							        Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
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							        <button class="btn btn-link btn-block text-left collapsed" type="button" data-toggle="collapse" data-target="#collapseThree" aria-expanded="false" aria-controls="collapseThree">
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							        Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
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